This bug is not very big and you can fix it easily. I will try my best to speak it easily.
The bug is: You can break a furnace (normal furnace) by a empty hand. And I don't have any tools like pickaxe or any effects like haste. It takes me 17.5 seconds to break it, but it loot a furnace.
Please fix it!
Linked issues
Comments

Thank you for your report!
We're tracking this issue in MCPE-33950, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki